Cutter-head.



01.,"J0HNS0N. GUTTER HEAD.

' APPLICATION FILED FEB. 13, 1908.`

Arm/mei A f PATENTED AUG. 4, 1908.-l Y

UNITED STATES CHARLES JOHNSON, OF NEW LONDON, WISCONSIN.

CUTTER-HE .AD

. No. 894,888. I

Specification of Letters Patent.

Patented Aug. 4, 1908.

.Application filed February 13, 1908. Serial No. 415,713.

To all vwhom it may concemf Be it known that I, CHARLES JOHNSON, acitizen of the UnitedStates, residing at New London, in the county ofOutagamie and State of Wisconsin, lhave invented a new and usefulImprovement in Cutter-Heads, of which the following is a specification.

My invention relates to cutter heads for surfacing lumber and consistsin arranging a plurality of pairs of knives in parallel relation uponopposite sides of acutter head shaft with the cutting edge of eachlpairlying along different helical lines and making the cutting action of theknives more nearly continuous than when the' knives have their cuttingedges parallel with the axial line of the cutter head shaft.

My improvement is shown in the accompanying drawing, in which,-

Figure 1 is a side elevation of the cutter head shaft without knives.Fig. 2 is a side elevation of the cutter head shaft, with knivesattached to it. Fig. 3 is a plan of one of the planer, or cuttingknives. Fig. 4 is an end view of the left hand end of the cutter head,in the circumferential position of that end in Figs. 1 and 2. Fig. 5 isan end view of the right hand en d of the cutter head, in the positioncircumferentially ofn that end in Figs. 1 and 2. Figs. 4 and 5 are upona smaller scale than Figs. 1, 2 and'3.

Similar numerals indicate like parts in the several views.

The cutter head 1 is formed with opposite knife seats in `parallelrelation for receiving any suitable number of pairsof knives, in thepresent case five pairs of seats, 2, 3, 4, 5 and 6 are shown, and theyare arranged in approximately uniformly stepped helical positions aroundthecutter head, the seats hav-` ing straight even faces adapted forhaving planer knives,'7, 8 and 9 bolted to` them, bolt holes 10 beingprovided for receiving bolts 1 1 with a washer 11a, between bolt headand knife. The knives are all of the same form excepting the end ones 7and 9 which are cut away on their edge for fitting the ends of thecutter head. The cutting edges 12 of the knives are curved transverselyof the knives on account of the angle at which they lie relative `to theaxial line of the cutter head with such a curve as will, when the knivesare bolted in position uponthe-cutter head, cut a straight even surfaceupon th'e lumber being planed.

It will be observed that the cutting edge of each` air of knives islocated in different l helicaPlines circumferentially of the circle inwhich said edges revolve, and that there is a small distance, 13, fromthe last cutting of one knife to the commencement of the cut in thesucceeding knife, and that with the ten knives as herein shown, therewill be ten separate moments of cutting and a like number of moments ofnearl uniform lengthof no cutting at each revo ution of the cutter head,instead of but two of each, as in the usual two knife cutter head withthe cuttin edges 0f the knives arallel with the axial line of thecutterhea the cutting action of the knives being thereby distributedmore evenly over the entire. circle of revolution of the cutting edge inthe helical, than in the parallel arrangement ofthe cutting edge. Thecutting action of the knives when arranged in helical lines is a drawingcut, that is, it is not a square cut across the article planed.

The distance from the last cutting of the knives 7 to the commencementof the cutting of the knife 9, may be approximately the same as thedistance between 7 and 8, 8 and 8 or 8 and 9.

The knives upon one side, say. the upper sidein Fig. 2, are intended tocut, (aside from the short s aces 13 between them), substantially onealf of the circle in which their cutting edges revolve, or in longercutter heads than here shown, they may be continued in the same helicalline, (of more or less angle with the axial line, than here shown,) andcomplete the circle if desired, the object being to distribute thecutting action of the knives evenly entirely around the cutter head,whether it be longer or shorter than the one here shown, the angle ofthe knife seats transversely of the cutter head and the width of theknives and their seats being made to correspond with the length of thecutter head. 14, indicates the journals of the cutter head, 15, chipbreakers.

Having described my invention, what I claim and desire to secure byLetters Patent, isf- 1. A cutter head, a plurality of seats in parallelrelation upon opposite sides of the cutter head arranged in pairs, eachseat having a plain even surface for receiving and having securedthereona cutting knife, the seats of each pair being adapted for havingthe cutting edges of their knives arranged helically around the axialline of the cutter head, each pair of seats being arranged in helicallines different circumferentially of the cutter head from the helicallines of an adjoining pair of seats, substantially as described.v

2. A cutter head, a plurality of seats in parallel relation uponopposite sides of the cutter head arranged in pairs, each seat having aplain even surface for receiving a cutting knife, a knife bolted uponeach seat, the cutting edge of each knife being curved transversely ofthe knife upon such a curve that When the head is revolved the knivesWill cut a flat even surface upon the article being laned, their cuttingedges being a1*- rangedphelically around the axial line of the cutterhead, said helical lines of each pair of knives being arranged in adifferent position around the cutter head from the helical lilies of anadjoining pair, which helical lines are spaced apart around the cutterhead at nearly equal distances, substantially as set forth.

CHARLES JOHNSON. Witnesses:

HANs LARsEN, S. W. MARSH.

